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Physics and astrophysics of strong magnetic field systems with eXTP

In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies of strongly magnetized objects. We will focus on the physics and astrophysics of strongly magnetized objects, namely magnetars, accreting X-ray pulsars, and rotation powered pulsars. We also discuss the science potential of eXTP for QED studies. Developed by an...

ERRATUM: ‘The variable spin-down rate of the transient magnetar XTE J1810-197’

Francesco Coti Zelati 5 8 9 Gian Luca Israel 2 Andrea Tiengo 3 10 11 Silvia Zane 6 0 INAF - Osservatorio Astronomico di Capodimonte , Salita Moiariello 16, I-80131 Napoli , Italy 1 New York University Abu

The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature

Castillo 6 7 ‹ Gian Luca Israel 7 Andrea Tiengo 5 11 12 David Salvetti 5 Roberto Turolla 9 10 Silvia Zane 9 Nanda Rea 13 14 Paolo Esposito 5 8 Sandro Mereghetti 5 Rosalba Perna 3 Luigi Stella 7 Jos e´ A

X-ray study of HLX1: intermediate-mass black hole or foreground neutron star?

We re-assess the XMM–Newton and Swift observations of HLX1 to examine the evidence for its identification as an intermediate-mass black hole. We show that the X-ray spectral and timing properties are equally consistent with an intermediate-mass black hole in a high state or with a foreground neutron star with a luminosity ∼ a few ×1032 erg s−1∼ 10−6LEdd, located at a distance of...

Unveiling the thermal and magnetic map of neutron star surfaces though their X-ray emission: method and light-curve analysis

Recent Chandra and XMM-Newton observations of a number of X-ray ‘dim’ pulsating neutron stars have revealed quite unexpected features in the emission from these sources. Their soft thermal spectrum, believed to originate directly from the star surface, shows evidence for a phase-varying absorption line at some hundred eVs. The pulse modulation is relatively large (pulsed...

Our distorted view of magnetars: application of the resonant cyclotron scattering model

The X-ray spectra of the magnetar candidates are customarily fitted with an empirical, two component model: an absorbed blackbody and a power-law. However, the physical interpretation of these two spectral components is rarely discussed. It has been recently proposed that the presence of a hot plasma in the magnetosphere of highly magnetized neutron stars might distort, through...

Timing analysis of the isolated neutron star RX J0720.4-3125 revisited

We present a reanalysis of the X-ray data for RX J0720.4-3125 presented in our previous paper, Zane et al., using more data recently available from XMM-Newton and Chandra. This analysis also corrects the ROSAT data used in that paper to the barycentric dynamical time (tdb) system, incorporates the revised XMM-Newton barycentric correction available since then, and corrects the...

XMM–Newton EPIC and Optical Monitor observations of Her X-1 over the 35-d beat period

We present the results of a series of XMM–Newton European Photon Imaging Camera (EPIC) and Optical Monitor observations of Her X-1, spread over a wide range of the 35-d precession period. We confirm that the spin modulation of the neutron star is weak or absent in the low state – in marked contrast to the main or short-on states. During the states of higher intensity, we observe...

Observatory science with eXTP

In this White Paper we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to Observatory Science targets. These include flaring stars, supernova remnants, accreting white dwarfs, low and high mass X-ray binaries, radio quiet and radio loud active galactic nuclei, tidal disruption events, and gamma-ray bursts. eXTP will be...

XMM—Newton EPIC observations of Her X-1

We present spin-resolved X-ray data of the neutron star binary Her X-1 taken using the EPIC detectors on XMM—Newton. The data were taken at three distinct epochs through the 35-d precession period. The energy-dependent light curves of this source vary significantly from epoch to epoch. It is known that the relative phasing of the soft (≲1 keV) and hard (≳2 keV) X-rays varies...

Timing analysis of the isolated neutron star RX J0720.4−3125

We present a combined analysis of XMM–Newton, Chandra and ROSAT observations of the isolated neutron star RX J0720.4−3125, spanning a total period of ∼7 yr. We develop a maximum likelihood periodogram for our analysis based on the ΔC statistic and the maximum likelihood method, which are appropriate for the treatment of sparse event lists. Our results have been checked a...